DE102012108290A1 - Structure for FinFETs as well as system of SRAM cells and memory cell having such a structure - Google Patents
Structure for FinFETs as well as system of SRAM cells and memory cell having such a structure Download PDFInfo
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- DE102012108290A1 DE102012108290A1 DE102012108290A DE102012108290A DE102012108290A1 DE 102012108290 A1 DE102012108290 A1 DE 102012108290A1 DE 102012108290 A DE102012108290 A DE 102012108290A DE 102012108290 A DE102012108290 A DE 102012108290A DE 102012108290 A1 DE102012108290 A1 DE 102012108290A1
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Abstract
Ein SRAM-Array ist aus einer Vielzahl aus Gratleitungen gebildeter FinFETs ausgebildet. Jede Gratleitung ist in einem Substrat ausgebildet, wobei ein unterer Abschnitt der Gratleitung von einem Isolationsbereich umgeben ist, und wobei sich ein oberer Abschnitt der Gratleitung oberhalb einer Oberfläche des Isolationsbereiches erstreckt. In einer ersten Querschnittsansicht des SRAM-Arrays weist jede Gratleitung eine rechteckige Form auf. In einer zweiten Querschnittsansicht weisen die Anschlüsse jeder Gratleitung eine angeschrägte Form auf.An SRAM array is formed of a plurality of fin lines of formed FinFETs. Each ridge line is formed in a substrate, wherein a lower portion of the ridge line is surrounded by an isolation area, and an upper portion of the ridge line extends above a surface of the isolation area. In a first cross-sectional view of the SRAM array, each fin line has a rectangular shape. In a second cross-sectional view, the terminals of each ridge line have a tapered shape.
Description
HINTERGRUNDBACKGROUND
Die Halbleiterindustrie hat aufgrund fortwährender Verbesserungen bei der Integrationsdichte einer Vielfalt elektronischer Komponenten (z. B. Transistoren, Dioden, Widerstände, Kondensatoren, etc.) ein rasches Wachstum erfahren. Größtenteils ist diese Verbesserung der Integrationsdichte in der wiederholten Verringerung der minimalen Bauteilgröße begründet, was es erlaubt, dass mehr Komponenten in einen vorgegebenen Bereich integriert werden können. Die geringere Bauteilgröße kann jedoch zu größeren Leckströmen führen. Da in letzter Zeit das Verlangen nach noch kleineren elektronischen Bauteilen angestiegen ist, ist ein Bedarf entstanden, den Leckstrom bei Halbleiterbauteilen zu verringern.The semiconductor industry has experienced rapid growth due to continuous improvements in the integration density of a variety of electronic components (eg, transistors, diodes, resistors, capacitors, etc.). For the most part, this improvement in integration density is due to the repeated reduction in minimum component size, which allows more components to be integrated within a given range. However, the smaller component size can lead to larger leakage currents. As the demand for even smaller electronic components has recently increased, a need has arisen to reduce the leakage current in semiconductor devices.
Bei einem komplementären Metalloxidhalbleiter(CMOS)-Feldeffekttransistor (FET) umfassen die aktiven Bereiche einen Drain, eine Source, einen Kanalbereich, der zwischen dem Drain und der Source angebunden ist, und eine Gate auf der Oberseite des Kanals, um den An- und den Auszustand des Kanalbereichs zu steuern. Wenn die Gatespannung eine Grenzspannung überschreitet, wird ein leitender Kanal zwischen dem Drain und der Source ausgebildet. Dies resultiert darin, dass Elektronen oder Löchern ermöglicht wird, sich zwischen dem Drain und der Source zu bewegen. Auf der anderen Seite wird idealerweise der Kanal unterbrochen, und es fließen keine Elektronen oder Löcher zwischen dem Drain und der Source, wenn die Gatespannung geringer als die Grenzspannung ist. Während sich jedoch die Halbleiterbauteile weiter verkleinern, kann die Gate aufgrund des Kurzkanalleckeffektes den Kanalbereich nicht vollständig kontrollieren, insbesondere nicht den Abschnitt des Kanalbereichs, welcher weit entfernt von der Gate angeordnet ist. Daraus resultiert, dass nachdem die Halbleiterbauteile in den unteren Sub-30-Nanometerbereich skaliert worden sind, die entsprechend kurze Gatelänge herkömmlicher Planartransistoren zu der Unfähigkeit der Gate führen kann, den Kanalbereich wesentlich abzuschalten.In a complementary metal oxide semiconductor (CMOS) field effect transistor (FET), the active regions include a drain, a source, a channel region connected between the drain and the source, and a gate on the top of the channel to surround the on and Off state of the channel area to control. When the gate voltage exceeds a threshold voltage, a conductive channel is formed between the drain and the source. This results in allowing electrons or holes to move between the drain and the source. On the other hand, ideally, the channel is broken and no electrons or holes flow between the drain and the source when the gate voltage is less than the threshold voltage. However, as the semiconductor devices continue to shrink, due to the short channel flip effect, the gate can not fully control the channel region, especially not the portion of the channel region that is located far from the gate. As a result, after the semiconductor devices have been scaled to the sub-30 nanometer lower range, the correspondingly short gate length of conventional planar transistors may result in the inability of the gate to substantially turn off the channel region.
Mit der Fortentwicklung der Halbleitertechnologien haben sich Fin-Feldeffekttransistoren (FinFETs) als eine wirkungsvolle Alternative herausgestellt, um den Leckstrom in Halbleiterbauteilen weiter zu verringern. Bei einem FinFET erstreckt sich ein aktiver Bereich, der den Drain, den Kanalbereich und die Source umfasst, von der Oberfläche des Halbleitersubstrats, auf welchem der FinFET angeordnet ist, nach oben. Der aktive Bereich des FinFET ist entsprechend einer Rippe in der Querschnittsansicht rechteckig geformt. Zusätzlich umschließt die Gatestruktur des FinFET den aktiven Bereich an drei Seiten wie ein umgekehrtes U. Daraus resultiert, dass die Steuerung des Kanals durch die Gatestruktur stabiler geworden ist. Der Kurzkanalleckeffekt herkömmlicher planarer Transistoren wurde verringert. Somit kann die Gatestruktur den Kanal besser steuern, wenn der FinFET ausgeschaltet ist, um den Leckstrom zu verringern.With the advancement of semiconductor technologies, fin field effect transistors (FinFETs) have emerged as an effective alternative to further reduce the leakage current in semiconductor devices. In a FinFET, an active region including the drain, the channel region, and the source extends upward from the surface of the semiconductor substrate on which the FinFET is disposed. The active area of the FinFET is rectangular shaped according to a rib in the cross-sectional view. In addition, the gate structure of the FinFET encloses the active region on three sides like an inverted U. As a result, the control of the channel by the gate structure has become more stable. The short channel leakage effect of conventional planar transistors has been reduced. Thus, the gate structure can better control the channel when the FinFET is turned off to reduce the leakage current.
ZUSAMMENFASSUNG DER ERFINDUNGSUMMARY OF THE INVENTION
Die vorliegende Erfindung stellt eine Vorrichtung gemäß dem unabhängigen Anspruch 1 bereit, die aufweist:
einen Isolationsbereich, der in einem Substrat ausgebildet ist;
eine Gratleitung, die in dem Substrat ausgebildet ist, wobei die Gratleitung mittels einer ersten Gate-Elektrodenstruktur ummantelt ist, um einen ersten Transistor auszubilden, wobei ein Ende der Gratleitung eine angeschrägte Form aufweist, und wobei die Gratleitung einen Kanal aufweist, der zwischen einem ersten Drain/Source-Bereich und einem zweiten Drain/Source-Bereich des ersten Transistors verbunden ist; und
eine zweite Gate-Elektrode, die die Gratleitung ummantelt, um einen Dummy-Transistor auszubilden.
- 1. Vorteilhafte Ausführungsformen der Vorrichtung sind in den
abhängigen Ansprüchen 2–6 angegeben. - 2. Die vorliegende Erfindung stellt weiterhin ein System gemäß dem unabhängigen Anspruch 7 bereit, das aufweist: eine erste durchgängige Gratleitung, welche von einem ersten Pass-Gate-Transistor und einem ersten Pull-Down-Transistor einer ersten Speicherzelle sowie einem dritten Pass-Gate-Transistor und einem dritten Pull-Down-Transistor einer zweiten Speicherzelle geteilt werden; eine zweite durchgängige Gratleitung, die von einem zweiten Pass-Gate-Transistor und einem zweiten Pull-Down-Transistor der ersten Speicherzelle sowie einem vierten Pass-Gate-Transistor und einem vierten Pull-Down-Transistor der zweiten Speicherzelle geteilt wird; eine Vielzahl unterbrochener Gratleitungen für einen Pull-Up-Transistor der ersten Speicherzelle und der zweiten Speicherzelle, und wobei die unterbrochene Gratleitung von einer ersten Gate-Elektrodenstruktur ummantelt ist, um einen Pull-Up-Transistor auszubilden; und wobei ein Ende der unterbrochenen Gratleitung eine angeschrägte Form aufweist; und eine zweite Gate-Elektrode, welche die unterbrochene Gratleitung ummantelt, um einen Dummy-Transistor auszubilden.
- 3. Vorzugsweise ist ein erstes Ende der unterbrochenen Gratleitung mit einem Spannungspotential verbunden; und ein zweites Ende der unterbrochenen Gratleitung ist in der zweiten Gate-Elektrode eingebettet.
- 4. Besonders bevorzugt weist die Gratleitung einen unteren Innenwinkel auf, der in einer ersten Querschnittsansicht mehr als 86° beträgt; und das erste Ende sowie das zweite Ende der Gratleitung weisen einen unteren Innenwinkel auf, der in einer zweiten Querschnittsansicht weniger als 83° beträgt.
- 5. Bei einer Ausführungsform des Systems umfasst die erste Querschnittsansicht eine erste Tiefe; und die zweite Querschnittsansicht umfasst eine zweite Tiefe, wobei die erste Tiefe dem 1,3-fachen der zweiten Tiefe entspricht.
- 6. Bei einer weiteren Ausführungsform des Systems umfasst die erste Querschnittsansicht eine erste Tiefe und eine zweite Tiefe; und die zweite Querschnittsansicht umfasst eine dritte Tiefe. Vorzugsweise entspricht die zweite Tiefe dem 2-fachen der ersten Tiefe; und die zweite Tiefe entspricht dem 1,3-fachen der dritten Tiefe.
- 7. Die vorliegende Erfindung stellt darüber hinaus eine Speicherzelle gemäß dem unabhängigen Anspruch 9 bereit, die aufweist: einen ersten Inverter, der einen ersten p-Typ-Transistor (PU) mit einer zweistufigen Gratstruktur und einen ersten n-Typ-Transistor (PD) mit der zweistufigen Gratstruktur aufweist, wobei der erste PU mit dem ersten PD in Reihe verbunden ist; einen zweiten Inverter, der mit dem ersten Inverter über Kreuz verbunden ist und einen zweiten PU mit der zweistufigen Gratstruktur sowie einen zweiten PD mit der zweistufigen Gratstruktur aufweist, wobei der zweite PU mit dem zweiten PD in Serie verbunden ist; einen ersten Pass-Gate-Transistor, der die zweistufige Gratstruktur aufweist, wobei der erste Pass-Gate-Transistor zwischen dem ersten Inverter und einer ersten Bitleitung verbunden ist; einen zweiten Pass-Gate-Transistor, der die zweite Gratstruktur aufweist, wobei der zweite Pass-Gate-Transistor zwischen dem zweiten Inverter und einer zweiten Bitleitung verbunden ist; ein erstes Dummybauteil, das mit dem ersten Inverter verbunden ist; und ein zweites Dummybauteil, das mit dem zweiten Inverter verbunden ist.
- 8. Vorzugsweise ist der erste Pass-Gate-Transistor auf einer ersten durchgängigen Gratleitung ausgebildet; der erste PD ist auf der ersten durchgängigen Gratleitung ausgebildet; der erste PU ist auf einer ersten unterbrochenen Gratleitung ausgebildet, der zweite PU ist auf einer zweiten unterbrochenen Gratleitung ausgebildet; der zweite Pass-Gate-Transistor ist auf einer zweiten durchgängigen Gratleitung ausgebildet; und der zweite PD ist auf der zweiten durchgängigen Gratleitung ausgebildet.
- 9. Besonders bevorzugt wird die unterbrochene Gratleitung von einer ersten Gate-Elektrodenstruktur ummantelt, um den PU-Transistor auszubilden; ein Ende der unterbrochenen Gratleitung weist eine angeschrägte Form auf; und eine zweite Gate-Elektrode ummantelt die unterbrochene Gratleitung, um einen Dummy-Transistor auszubilden.
- 10. Bei einer Ausführungsform der Speicherzelle sind eine Source des Dummy-Transistors und ein Gate des Dummy-Transistors miteinander verbunden.
- 11. Bei einer weiteren Ausführungsform der Speicherzelle weist die angeschrägte Form einen unteren Innenwinkel auf, der mehr als 86° beträgt; und die unterbrochene Gratleitung weist in einer Querschnittsansicht einen unteren Innenwinkel auf, der weniger als 83° beträgt.
- 12. In noch einer weiteren Ausführungsform der Speicherzelle sind eine Source des Dummy-Transistors und eine Gate des Dummy-Transistors über einen Kuppenkontakt miteinander verbunden.
an isolation region formed in a substrate;
a ridge line formed in the substrate, the ridge line being sheathed by a first gate electrode structure to form a first transistor, wherein one end of the ridge line has a tapered shape, and wherein the ridge line has a channel disposed between a first one Drain / source region and a second drain / source region of the first transistor is connected; and
a second gate electrode overlying the ridge line to form a dummy transistor.
- 1. Advantageous embodiments of the device are specified in the dependent claims 2-6.
- 2. The present invention further provides a system according to independent claim 7, comprising: a first continuous ridge line comprising a first pass-gate transistor and a first pull-down transistor of a first memory cell and a third pass-gate Transistor and a third pull-down transistor of a second memory cell are shared; a second continuous ridge line shared by a second pass-gate transistor and a second pull-down transistor of the first memory cell and a fourth pass-gate transistor and a fourth pull-down transistor of the second memory cell; a plurality of interrupted ridge lines for a pull-up transistor of the first memory cell and the second memory cell, and wherein the broken ridge line is covered by a first gate electrode structure to form a pull-up transistor; and wherein one end of the broken ridge line has a tapered shape; and a second gate electrode overlying the broken ridge line to form a dummy transistor.
- 3. Preferably, a first end of the broken ridge line is connected to a voltage potential; and a second end of the broken ridge line is embedded in the second gate electrode.
- 4. Particularly preferably, the ridge line has a lower inner angle, which is more than 86 ° in a first cross-sectional view; and the first end and the second end of the fin line have a lower inner angle, which is less than 83 ° in a second cross-sectional view.
- 5. In one embodiment of the system, the first cross-sectional view includes a first depth; and the second cross-sectional view includes a second depth, wherein the first depth is 1.3 times the second depth.
- 6. In another embodiment of the system, the first cross-sectional view includes a first depth and a second depth; and the second cross-sectional view includes a third depth. Preferably, the second depth is twice the first depth; and the second depth is 1.3 times the third depth.
- 7. The present invention further provides a memory cell according to independent claim 9, comprising: a first inverter comprising a first p-type transistor (PU) having a two-stage fin structure and a first n-type transistor (PD) having the two-stage fin structure, wherein the first PU is connected in series with the first PD; a second inverter cross-connected to the first inverter and having a second PU having the two-stage fin structure and a second PD having the two-stage fin structure, the second PU being connected in series with the second PD; a first pass-gate transistor having the two-stage fin structure, the first pass-gate transistor connected between the first inverter and a first bit line; a second pass-gate transistor having the second fin structure, the second pass-gate transistor connected between the second inverter and a second bit line; a first dummy component connected to the first inverter; and a second dummy component connected to the second inverter.
- 8. Preferably, the first pass-gate transistor is formed on a first continuous ridge line; the first PD is formed on the first continuous ridge line; the first PU is formed on a first broken ridge line, the second PU is formed on a second broken ridge line; the second pass-gate transistor is formed on a second continuous ridge line; and the second PD is formed on the second continuous ridge line.
- 9. Particularly preferably, the interrupted ridge line is encased by a first gate electrode structure in order to form the PU transistor; one end of the broken ridge line has a tapered shape; and a second gate electrode sheathed the broken ridge line to form a dummy transistor.
- 10. In one embodiment of the memory cell, a source of the dummy transistor and a gate of the dummy transistor are connected together.
- 11. In a further embodiment of the storage cell, the bevelled shape has a lower inner angle which is more than 86 °; and the broken ridge line has a lower interior angle, which is less than 83 °, in a cross-sectional view.
- 12. In yet another embodiment of the memory cell, a source of the dummy transistor and a gate of the dummy transistor are connected to each other via a tip contact.
KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES
Für ein umfassenderes Verständnis der vorliegenden Offenbarung und deren Vorteile wird nunmehr Bezug auf die nachstehende Beschreibung genommen, welche in Verbindung mit den begleitenden Figuren herangezogen wird, wobei:For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
Übereinstimmende Bezugszeichen und Symbole in den verschiedenen Figuren beziehen sich grundsätzlich auf entsprechende Bauteile, soweit dies nicht anderweitig angegeben ist. Die Figuren sind derart gezeichnet, dass sie die relevanten Aspekte der verschiedenen Ausführungsformen klar veranschaulichen und sie sind nicht notwendigerweise maßstabsgetreu gezeichnet.Corresponding reference numerals and symbols in the various figures basically refer to corresponding components unless otherwise indicated. The figures are drawn to clearly illustrate the relevant aspects of the various embodiments and are not necessarily drawn to scale.
GENAUE BESCHREIBUNG DER VERANSCHAULICHENDEN AUSFÜHRUNGSFORMENDETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
Herstellung und Verwendung der vorliegenden Ausführungsformen werden nachstehend im Detail diskutiert. Es sollte jedoch anerkannt werden, dass die vorliegende Offenbarung viele anwendbare erfindungsgemäße Konzepte bereitstellt, die auf einem weiten Gebiet spezifischer Anwendungen umgesetzt werden können. Die diskutierten spezifischen Ausführungsformen dienen lediglich zur Veranschaulichung spezifischer Art und Weisen, um die Ausführungsformen der Offenbarung anzuwenden und beschränken nicht den Umfang der Offenbarung.Production and use of the present embodiments will be discussed in detail below. It should be appreciated, however, that the present disclosure provides many applicable inventive concepts that can be implemented in a wide range of specific applications. The specific embodiments discussed are merely illustrative of specific ways to apply the embodiments of the disclosure and do not limit the scope of the disclosure.
Die vorliegende Offenbarung wird mit Bezug auf Ausführungsformen in einem bestimmten Zusammenhang beschrieben, nämlich einem Fin-Feldeffekttransistor (FinFET), der an seinen Anschlusselementen eine angeschrägte Form aufweist. Die Ausführungsformen der Offenbarung können dennoch ebenso auf eine Vielfalt von Halbleiterbauteilen angewendet werden. Nachfolgend werden verschiedene Ausführungsformen in Bezug auf die begleitenden Zeichnungen im Detail erläutert.The present disclosure will be described with reference to embodiments in a specific context, namely a fin field effect transistor (FinFET), which has a tapered shape at its connection elements. Nevertheless, the embodiments of the disclosure may also be applied to a variety of semiconductor devices. Hereinafter, various embodiments will be explained in detail with reference to the accompanying drawings.
Wie in
Das Halbleiterbauteil kann darüber hinaus verschiedene Kontakte haben, wie den Gatekontakt
Die
In dem Substrat
Die STI-Strukturen (z. B. der Isolationsbereich
Die
In
Gemäß einer Ausführungsform ist der FinFET ein p-Typ-Transistor, wobei ein epitaktisch aufgewachsenes Material der Drain/Source-Bereiche
Die Drain/Source-Bereiche
Das Halbleiterbauteil kann darüber hinaus eine dielektrische Zwischenschicht (nicht dargestellt) aufweisen, die über dem Substrat
Das leitfähige Material wird zu einer Oberfläche der dielektrischen Zwischenschicht planarisiert, beispielsweise mittels chemisch-mechanischem Polieren (CMP), wobei leitfähiges Material in den Kontaktöffnungen zurückbleibt, um Kontakte
Die Kontakte
Eine vorteilhafte Eigenschaft des Vorliegens eines angeschrägt geformten Gratanschlusskontaktes besteht darin, dass der Gratanschlusskontakt mit der angeschrägten Form dabei hilft, das elektrische Feld zwischen dem Gratende und der Dummy-Gate-Elektrode (beispielsweise dem Gate
Die
Es sollte darüber hinaus festgehalten werden, dass die Dummygates (beispielsweise die Dummygates
Die
Die
Wie in
Bei einem SRAM-Array (nicht dargestellt), das die 6T-SRAM-Zellen verwendet, sind die Zellen in Reihen und Spalten angeordnet. Die Spalten des SRAM-Arrays werden mithilfe eines Bitlinienpaares ausgebildet, nämlich einer ersten Bitlinie BL und einer zweiten Bitlinie BLB. Darüber hinaus sind die Zellen des SRAM-Arrays zwischen entsprechenden Bitlinienpaaren angeordnet. Wie in
Wie in
Wie in dem Schaltdiagramm gemäß
Wenn beim Betrieb die Pass-Gate-Transistoren PG1 und PG2 inaktiv sind, wird die SRAM-Zelle
Während eines Schreibvorgangs werden die Bitlinien BL und BLB auf entgegengesetzte Werte entsprechend der neuen Daten, die in die SRAM-Zelle
Während eines READ-Prozesses wird über einen aktivierten. Pass-Gate-Transistor PG1 und PG2 eine Bitlinie, die mit dem eine logische „0” speichernden Speicherknoten verbunden ist, auf eine niedrigere Spannung entladen. Währenddessen verbleiben die anderen Bitzeilen bei ihrer vorgeladenen Spannung, weil kein Entladungspfad zwischen den anderen Bitlinien und dem Speicherknoten, der die logische „1” speichert, besteht. Die Differenzialspannung zwischen BL und BLB (ungefähr in einem Bereich zwischen 50 bis 100 mV) wird mit einem Leseverstärker (nicht dargestellt) gemessen. Darüber hinaus verstärkt der Leseverstärker die Differenzspannung und gibt den logischen Status der Speicherzelle über einen Datenpuffer weiter.During a READ process is activated via an. Pass-gate transistor PG1 and PG2 a bit line, which is connected to the logic "0" storing storage node, discharged to a lower voltage. Meanwhile, the other bit lines remain at their precharged voltage because there is no discharge path between the other bit lines and the storage node storing the logical "1". The differential voltage between BL and BLB (approximately in a range between 50 to 100 mV) is measured with a sense amplifier (not shown). In addition, the sense amplifier amplifies the differential voltage and passes the logic state of the memory cell via a data buffer.
Der untere Abschnitt von
Zwei vertikale Strichlinien, welche die SRAM-Zelle
Wie in
Wie in
Verschiedene Kontaktierungen und ihre entsprechenden Durchkontaktierungen für die Bindung untereinander können angewendet werden, um die Komponenten in der SRAM-Zelle
Ein Energiequellenkontakt VCC ist mit der Source des Pull-Up-Transistors PU1 verbunden, wobei ein anderer Energiequellenkontakt VCC mit der Source des Pull-Up-Transistors PU2 verbunden ist. Ein Erdungskontakt VSS ist mit der Source des Pull-Down-Transistors PD1 verbunden, wobei ein anderer Erdungskontakt VSS mit der Source des Pull-Down-Transistors PD2 verbunden ist. Ein Speicherknotenkontakt SN verbindet die Source des Transistors PG1 und die Drains der Transistoren PD1 und PU1. Ein weiterer Speicherknotenkontakt SNB verbindet die Source des Transistors PG2 mit den Drains der Transistoren PD2 und PU2.A power source contact VCC is connected to the source of the pull-up transistor PU1, and another power source contact VCC is connected to the source of the pull-up transistor PU2. A ground contact VSS is connected to the source of the pull-down transistor PD1, and another ground contact VSS is connected to the source of the pull-down transistor PD2. A storage node contact SN connects the source of the transistor PG1 and the drains of the transistors PD1 and PU1. Another storage node contact SNB connects the source of the transistor PG2 to the drains of the transistors PD2 and PU2.
Die SRAM-Zelle
Die
Es sollte festgehalten werden, dass, während
Die
Wie in
Gemäß einer Ausführungsform können der obere Abschnitt des oberen Rechtecks und der obere Abschnitt des unteren Trapezes unterschiedliche Dotierungskonzentrationen aufweisen, um eine bessere Transistorgrenzwertfeinabstimmung sowie eine bessere Anti-Durchschlags- und Wallisolation zu erreichen. Beispielsweise kann der obere Abschnitt des Rechtecks eine höhere Dotierungskonzentration als der obere Abschnitt des Rechtecks aufweisen.In one embodiment, the upper portion of the upper rectangle and the upper portion of the lower trapezoid may have different doping concentrations to provide better transistor threshold fine tuning, as well as better anti-breakdown and wall isolation to reach. For example, the upper portion of the rectangle may have a higher doping concentration than the upper portion of the rectangle.
Die Drains der Pull-Up-Transistoren PU1 und Pull-Down-Transistoren PD1 sowie die Drains der Pull-Up-Transistoren PU2 und Pull-Down-Transistoren PD2 sind miteinander verbunden. Die Transistoren PU1 und PD1 sind über Kreuz mit den Transistoren PU2 und PD2 verbunden, um einen Datenriegel auszubilden. Die Gates der Transistoren PU1 und PD1 sind ebenso wie die Drains der Transistoren PU2 und PD2 miteinander verbunden, wobei die Gates der Transistoren PU2 und PD2 miteinander und mit den Drains der Transistoren PU1 und PD2 verbunden sind. Die Sources der Pull-Up-Transistoren PU1 und PU2 sind mit der Spannungsversorgung Vdd verbunden, und die Sources der Pull-Down-Transistoren PD1 und PD2 sind mit einer Erdspannung Vss verbunden.The drains of the pull-up transistors PU1 and pull-down transistors PD1 and the drains of the pull-up transistors PU2 and pull-down transistors PD2 are connected together. Transistors PU1 and PD1 are cross-connected to transistors PU2 and PD2 to form a data latch. The gates of the transistors PU1 and PD1 are connected to one another like the drains of the transistors PU2 and PD2, the gates of the transistors PU2 and PD2 being connected to one another and to the drains of the transistors PU1 and PD2. The sources of the pull-up transistors PU1 and PU2 are connected to the power supply Vdd, and the sources of the pull-down transistors PD1 and PD2 are connected to a ground voltage Vss.
Der Speicherknoten N1 des Datenriegels ist mit der Bitleitung BL über den Pass-Gate-Transistor PG1 verbunden, und der Speicherknoten N2 ist an die komplementäre Bitleitung BLB über den Pass-Gate-Transistor PG2 verbunden. Die Speicherknoten N1 und N2 sind komplementäre Knoten, welche häufig auf entgegengesetzten logischen Niveaus vorliegen (Logisch hoch oder logisch niedrig). Die Gates der Pass-Gate-Transistoren PG1 und PG2 sind an eine Word-Leitung WL angebunden. Die Source und das Gate des Dummy-Transistors Dummy-1 sind miteinander und mit dem Speicherknoten N1 verbunden, und die Source und das Gate des Dummy-Transistors Dummy-2 sind miteinander und mit dem Speicherknoten N2 verbunden. Die Drains der Dummy-Transistoren Dummy-1 und Dummy-2 werden als potenzialfrei („floating”) bezeichnet, können jedoch in aneinandergrenzenden Zellen mit entsprechenden Dummy-Transistoren verbunden sein.The storage node N1 of the data latch is connected to the bit line BL via the pass-gate transistor PG1, and the storage node N2 is connected to the complementary bit line BLB via the pass-gate transistor PG2. The storage nodes N1 and N2 are complementary nodes which are often at opposite logical levels (logical high or logic low). The gates of the pass-gate transistors PG1 and PG2 are connected to a word line WL. The source and the gate of the dummy transistor dummy-1 are connected to each other and to the storage node N1, and the source and the gate of the dummy transistor dummy-2 are connected to each other and to the storage node N2. The drains of the dummy transistors dummy-1 and dummy-2 are referred to as floating, but may be connected in contiguous cells to corresponding dummy transistors.
Die
Die
In
Die
Die
Obwohl Ausführungsformen der vorliegenden Offenbarung und ihre Vorteile im Detail beschrieben worden sind, sollte verstanden werden, dass verschiedene Änderungen, Ersetzungen und Abwandlungen hiervon durchgeführt werden können, ohne dass dadurch vom Umfang der Offenbarung, wie sie in den anhängenden Ansprüchen beschrieben ist, abgewichen wird.Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the disclosure as described in the appended claims.
Darüber hinaus ist nicht beabsichtigt, den Umfang der vorliegenden Anmeldung auf bestimmte Ausführungsformen des Prozesses, der Maschine, der Herstellung, der Zusammensetzung der Materie, der Mittel, der Verfahren und Schritte, die im Anmeldetext beschrieben sind, zu beschränken. Wie der Fachmann ohne weiteres aufgrund der vorliegenden Offenbarung zu schätzen weiß, können Prozesse, Maschinen, Herstellungsverfahren, Zusammensetzung der Materie, Mittel, Verfahren oder Schritte, die bereits existieren oder später erst entwickelt werden, welche im Wesentlichen dieselbe Funktion durchführen oder im Wesentlichen dasselbe Ergebnis wie die entsprechenden hier beschriebenen Ausführungsformen erreichen, entsprechend der vorliegenden Offenbarung verwendet werden. Dementsprechend ist beabsichtigt, dass die anhängenden Ansprüche in ihrem Schutzumfang derartige Prozesse, Maschinen, Herstellungsverfahren, Zusammensetzung der Materie, Mittel, Verfahren oder Schritte mit einschließen.Furthermore, it is not intended to limit the scope of the present application to specific embodiments of the process, machine, manufacture, composition of matter, means, methods, and steps described in the application text. As those skilled in the art will readily appreciate based on the present disclosure, processes, machines, manufacturing methods, composition of matter, means, methods, or steps that already exist or may be developed later, perform substantially the same function or substantially the same result as the corresponding embodiments described herein can be used in accordance with the present disclosure. Accordingly, it is intended that the appended claims encompass within their scope such processes, machines, manufacturing processes, matter composition, means, processes or steps.
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